Stability analysis of fractional-order linear system with PID controller in the output feedback structure subject to input saturation

In this paper PID controller and fractional order linear system (FO-LTI) subject to input saturation augmented in the static output feedback structure. In fact, the control scheme is defined by solving the output feedback problem. The Lyapunov direct method for stability analysis of the fractional-order linear system subject to input saturation with 0 < a < 1 is adopted. The output feedback investigated in the first step. To estimate the region of attraction based on the ellipsoid approach, a new stability condition through the saturation function is embraced. Finally, the iterative LMI structure endorsed output feedback and region of attraction enlargement, as well as the stability condition approach. In fact, the main advantage of this paper is the design of the PID controller in the static output feedback layout in the presence of the saturation function, stability condition and the expansion of the region of attraction. Some numerical examples based on certain theorems are used to illustrate the superiority and effectiveness of the proposed approach.

Automated summary

This paper investigates the static output feedback structure of PID controller and fractional order linear system subject to input saturation. The stability analysis of the fractional-order linear system under input saturation conditions is performed using the Lyapunov direct method. An new stability condition based on the saturation function is proposed to estimate the region of attraction using the ellipsoid approach. The iterative LMI structure is employed to endorse output feedback, region of attraction enlargement, and stability conditions. The main advantage of this paper lies in the design of the PID controller in the static output feedback layout under the presence of saturation function, stability conditions, and expansion of the region of attraction. Numerical examples are used to demonstrate the superiority and effectiveness of the proposed approach.